numeric ip for nameserver

I want a numeric string next to nameservers on the site I have domain name. Please help me if I can not find this ip part on the site.
Because I have such a feature in my domain name

If your domain registrar need to know the IP address of the nameserver for some reason, any old DNS lookup tool will do. I regularly use . Simply enter the nameserver e.g. in the big text field, hit Enter and the IP address is there.